A rotary tamping system for high silicon alloy closed electric furnace

Abstract

The present invention discloses a rotary tamping system for a high-silicon alloy closed electric furnace, characterized in that it includes a rotary furnace cover, a material surface processing device, and a sealing system; by arranging a circular track on the furnace cover platform, and then the driving device drives the movable cover to rotate along the circular track, the material surface processing device can perform circular motion or reciprocating motion between fixed angles along the furnace body along with the rotating furnace cover, so that the rotary furnace cover can realize automatic tamping of materials, avoid manual operation, improve the production environment, and greatly reduce the risk of safety accidents. The present application meets the requirements for tamping of high-silicon alloy electric furnaces in a closed smelting state, avoids the risk of CO poisoning caused by flammable and explosive gases such as CO in production from overflowing the furnace cover, or the risk of CO flash explosion during the process of opening the furnace door; at the same time, the split rotary furnace cover is conducive to reducing the number of furnace cover hangings and the size of their load, helps to optimize the plant structure design, and reduces the cost of civil engineering investment.

Description

Technical Field

[0001] The invention relates to the technical field of high-silicon alloy smelting, in particular to a rotary ramming system for a high-silicon alloy closed electric furnace. Background Art

[0002] At present, the production of high-silicon alloys mostly adopts semi-closed electric furnaces, in which the furnace cover is a regular hexagonal semi-closed smoke hood structure, supported by six columns on the smoke hood platform, and assembled by several petals; it is divided into a center cover and an edge cover, and the top cover has electrode holes, material pipe holes, flue holes, etc. The short smoke hood is mostly a water-cooled cavity structure with refractory materials knotted on the inside to block radiant heat.

[0003] When smelting high-silicon alloys, due to their smelting characteristics, the furnace door needs to be opened and the charge surface needs to be treated to improve the permeability of the charge. Negative pressure is often used in the furnace, which will cause a large amount of air to enter the furnace, causing the CO and other gases produced by the reaction in the furnace to burn, releasing a large amount of heat, making the working environment of the electrode worse, accelerating the oxidation of the electrode, and reducing the equipment operation rate.

[0004] Because existing production processes utilize semi-enclosed electric furnaces, a large amount of CO generated during the SiO2 reduction process within the furnace is burned and converted into CO2, which is then discharged from the exhaust system. Currently, efforts are underway to fully enclose high-silicon alloy submerged arc furnaces. However, once sealed, high-silicon alloy electric furnaces cannot handle the charge surface like conventional surface treatment methods such as tamping carts. Installing surface treatment equipment on the side of a traditional furnace cover complicates the structural design of the furnace cover. Because the furnace cover is fixed, the surface treatment equipment has a limited operating range and can only handle charge surface treatment in certain areas of the furnace. To achieve multi-directional and multi-zone charge surface treatment, a sufficient number of tamping devices must be installed on the furnace cover, presenting a significant challenge both in design and in operation and maintenance.

[0005] In the Chinese utility model patent with authorization announcement number CN216592716 U and authorization announcement date 2022.05.24, a closed rotating ferroalloy ore furnace is disclosed, including a fixed furnace cover, a furnace body, a rotating power mechanism, and a material surface loosening mechanism; a sealing structure is provided between the fixed furnace cover and the furnace body, and the furnace body is installed on the rotating power mechanism. The rotating power mechanism drives the furnace body to rotate relative to the fixed furnace cover. The sealing structure maintains a sealed connection between the fixed furnace cover and the furnace body and ensures normal rotation between the two: the material surface loosening mechanism is installed on the electric furnace mounting platform and extends from the fixed furnace cover into the furnace body, thereby stirring the material surface in the furnace body, and the material surface loosening mechanism extends through the fixed furnace cover for a sealed connection. However, this invention cannot adapt to the actual production of high-silicon alloys. The actual production of high-silicon alloys requires furnace tamping operations in multiple areas, that is, in the entire circumferential direction, while the comparative document can only achieve furnace tamping in a specific area; secondly and most importantly, the production of closed electric furnaces will produce flammable and explosive gases such as CO. Therefore, in order to prevent the risk of explosion caused by air entering the furnace cover, a micro-positive pressure operation is often adopted in the furnace. However, in this solution, the furnace door needs to be opened when the furnace tamping machine is extended into the furnace. The flammable and explosive gases such as CO produced by the high-silicon alloy reaction will overflow the furnace cover, which is prone to the risk of CO poisoning, or the risk of CO flash explosion when the furnace door is opened. Summary of the Invention

[0006] To overcome the problems existing in the prior art, the present invention aims to provide a rotary tamping system for a sealed high-silicon alloy electric furnace. This system uses a rotating furnace cover to achieve automated tamping, eliminating manual operation, improving the production environment, and significantly reducing the risk of safety accidents. The tamping equipment can move along the circumference of the furnace body along with the rotating furnace cover, meeting the tamping requirements of the sealed high-silicon alloy electric furnace during smelting, preventing flammable and explosive gases such as CO from overflowing the furnace cover, potentially causing CO poisoning, or CO flashovers during furnace door opening. The use of a bellows seal or spherical seal structure effectively achieves angular compensation for the material surface handling equipment in all directions, while also providing a strong sealing effect.

[0007] To achieve the above object, the present invention provides the following technical solutions: a rotary ramming system for a high silicon alloy closed electric furnace, comprising a rotary furnace cover, a material surface treatment device and a sealing system;

[0008] The rotary furnace cover includes a top fixed cover, a cover hanging, multiple sets of movable cover, a circular track and a driving device, and the movable cover includes a movable side cover, a side cover support and a moving trolley;

[0009] The material surface processing equipment includes a rotating support, a rotary drive device, a material surface processing bracket, a multi-stage hydraulic cylinder, a lifting cylinder, a cylinder fixed support and a material surface processing rod; the material surface processing equipment is fixed on the mobile trolley;

[0010] The sealing system comprises an annular support plate, an adjusting nut, a cylindrical spring, an externally threaded pipe sleeve, an annular fixing plate, a spring fixing pipe, an annular pressure plate, graphite packing, filling sand and an annular contact plate.

[0011] The present invention is further configured as follows: the annular track is installed around the furnace body on the furnace cover platform, and multiple groups of movable carriages are connected to each other and arranged along the annular track around the circumference of the furnace mouth; the movable carriages are further provided with cylindrical pin teeth on the side away from the furnace mouth.

[0012] The top fixed cover is assembled from several petals and features holes for the feed pipe, electrode posts, flue, explosion-proof holes, and a maintenance door. The top fixed cover and movable side covers are water-cooled chambers with knotted refractory material inside.

[0013] By adopting the above technical solution, the cover plate hanging can lift the top fixed cover plate and has the function of adjusting the height of the top fixed cover plate. The top fixed cover plate is fixed on the upper platform or steel structure by several cover plate hangings.

[0014] The present invention is further configured as follows: the mobile trolley includes a frame, wheels, a counterweight mechanism, a wheel axle and cylindrical pin teeth, the wheels are arranged at the bottom of the frame and connected through the wheel axle, and the wheel axle is provided with a differential device; the counterweight mechanism is installed on the frame; the side cover plate support is installed on the mobile trolley near the furnace mouth, the movable side cover plate is fixed on the side cover plate support, and runs synchronously with the mobile trolley, and multiple groups of the movable side cover plates are connected by crimping or any of the connection methods.

[0015] Sensors, encoders and other components can also be installed on the mobile trolley to accurately determine the rotation angle and position of the mobile trolley relative to the top fixed cover.

[0016] The present invention is further configured such that the connection mode of the plurality of mobile small workshops is any one of an elastic connection with adjustable spacing and a rigid connection.

[0017] By adopting this technical solution, the weight of the traditional furnace roof is divided into two parts: one is the top fixed cover plate, and the other is the rotating furnace roof part, which is mounted on the furnace roof platform and consists of multiple sets of interconnected movable cover plates. The cover plate hanging only lifts the top fixed cover plate, which helps reduce the number of furnace cover hanging parts and the load, helps optimize the plant structure design, and reduces civil engineering investment.

[0018] The present invention is further configured as follows: the driving device includes a motor reducer, a coupling, a worm gear reducer and a pinion; the driving device is installed on the furnace cover platform; the motor reducer is connected to the input shaft of the worm gear reducer through a coupling; the output shaft of the worm gear reducer is connected to the pinion; the pinion is engaged with the cylindrical pin teeth on the moving trolley; the driving device is arranged in equal parts at intervals of 120° along the circumferential direction of the rotating furnace cover and is powered by an annular contact slide wire fixed on the furnace cover platform.

[0019] By adopting this technical solution, the drive device meshes with the cylindrical pins on the moving trolley through gears, driving the trolley along the circular track on the furnace cover platform, thereby achieving rotational movement of the furnace cover. In actual production, a tamping mechanism can be fixed to the rotating furnace cover, which drives the tamping mechanism along the circumference of the furnace body, achieving multi-angle automated tamping, eliminating manual operation, improving the production environment, and significantly reducing the risk of safety accidents.

[0020] The present invention is further configured as follows: the material surface processing rod includes a first section of the material surface processing rod, a second section of the material surface processing rod and a third section of the material surface processing rod; the material surface processing rod is connected to a cylinder fixing seat to achieve relative sliding; the first section of the material surface processing rod and the second section of the material surface processing rod are connected by insulated bolts; the multi-stage hydraulic oil cylinder is fixed in the cylinder fixing seat, the end of the multi-stage hydraulic oil cylinder is fixed at the second section of the material surface processing rod, and the oil rod of the multi-stage hydraulic oil cylinder moves in the air cavity formed by the second section and the third section of the material surface processing rod.

[0021] Through the above technical solution, the surface processing rod can be extended and contracted within a certain range, wherein the first section and the second section are connected by insulated bolts, which is convenient for replacement.

[0022] The present invention is further configured as follows: the cylinder fixing seat is fixed to the material surface processing bracket by a pin connection, one end of the lifting cylinder is connected to the material surface processing bracket, and the other end is connected to the cylinder fixing seat, which is used to adjust the pitch angle of the material surface processing rod; the material surface processing bracket is installed on the rotary drive device, and the rotary drive device is fixed to the rotating support by a bolt connection, and the rotary drive device is driven by a hydraulic motor; the rotating support is installed on a mobile trolley.

[0023] The purpose of the above solution is to achieve the rotation of the material surface treatment rod along the circumference at a specific angle, so that the material surface treatment equipment can move along the circumference of the furnace body with the trolley. The same function can also be achieved by using a transmission mechanism such as a motor or gear instead of the rotary drive device.

[0024] The present invention is further configured as follows: a hole is provided on the movable side cover plate, a flange is welded to the outer ring of the hole, and the material surface processing rod passes through the hole on the movable side cover plate and extends into the high-silicon alloy closed electric furnace; the material surface processing equipment also includes a sealing device, which is provided at the hole; the sealing device is any one of a bellows sealing sleeve and a joint shaft spherical seal; three material surface processing devices are provided along the circumferential direction of the rotating furnace cover, arranged equally at an interval of 120°, and respectively installed on the vertical planes of the center lines of the two electrode columns.

[0025] Taking the bellows sealing sleeve as an example, flanges are provided at both ends of the bellows sealing sleeve. One end of the bellows sealing sleeve is connected to the cylinder fixing seat, and the other end is connected to the flange on the movable side cover of the rotary furnace cover. The cylinder fixing seat can achieve displacement in all directions within a certain range inside the bellows sealing sleeve, which facilitates the pounding movement of the material surface processing rod.

[0026] A high-temperature resistant infrared detection device is provided in the high-silicon alloy closed electric furnace, which, in conjunction with a rotating furnace cover and material surface processing equipment, can realize precise tamping operations at multiple positions and angles in the furnace.

[0027] The present invention is further configured as follows: the annular fixing plate is welded and fixed on the movable side cover plate, and several annular fixing plates form an annular fixing bracket; the annular support plate is welded on the annular fixing plate, and the annular pressure plate is arranged on the annular fixing bracket with a certain gap left between it and the annular fixing plate, and the gap is filled with sand.

[0028] The present invention further comprises the following configurations: the externally threaded sleeve is welded to the annular fixing plate; the adjusting nut is formed by welding a nut to a circular tube with internal threads, and is threadedly connected to the externally threaded sleeve; the spring fixing tube is welded to the annular pressure plate, and the cylindrical spring is fixed to the spring fixing tube and extends into the interior of the externally threaded sleeve. The annular contact plate is fixed to the side of the top fixing cover plate, and graphite packing is filled between the annular contact plate and the annular pressure plate.

[0029] With this technical solution, the cylindrical spring is pressed downward by rotating the adjustment nut. The deformation of the cylindrical spring transmits pressure to the annular pressure plate, which then slides along the annular support plate, exerting pressure on the graphite packing. This creates pressure contact with the annular contact plate, achieving a seal. Sand is also filled in the gap between the annular retaining plate and the annular pressure plate to ensure a reliable seal.

[0030] In summary, the beneficial effects of the above technical solution of the present invention are as follows:

[0031] 1. The present invention provides a furnace cover structure that can realize the closed production of high-silicon alloys. A material surface processing device is installed on the rotating furnace cover. The rotation of the rotating trolley drives the rotation of the material surface processing device to realize multi-angle and multi-area furnace ramming operations, overcoming the problem that the production of high-silicon alloys generally uses a rotating furnace body to loosen the furnace charge, which can only assist in loosening the furnace charge, and ensures good air permeability of the material surface.

[0032] 2. The present invention can realize automatic tamping, avoid manual operation, improve the production environment, and greatly reduce the risk of safety accidents.

[0033] 3. The present invention provides a sealing system that can well realize the dynamic sealing process of the rotary furnace cover. It can not only automatically adapt to the gap caused by the elliptical deformation of the rotary furnace cover caused by heat to achieve a good sealing effect, but also the graphite has a self-lubricating effect, which is easy to replace and has a good sealing effect. It also avoids the dangers and reliability of traditional water sealing, and the contact pressure can also be manually adjusted.

[0034] 4. The present invention provides a split rotary furnace cover, which divides the weight of the traditional furnace cover into two parts, which is beneficial to reducing the number of furnace cover hangings and the size of the load, helping to optimize the plant structure design and reduce civil engineering investment.

[0035] 5. The multi-stage hydraulic cylinder of the present invention is located within a cavity formed by an external telescopic sleeve, isolating it from external heat radiation and providing excellent protection for the cylinder. When the surface treatment operation is completed, the multi-stage hydraulic cylinder retracts to its initial state, shielding the surface treatment equipment from the high-temperature zone within the furnace. The circulating hydraulic oil cools the multi-stage hydraulic cylinder, extending the service life of the multi-stage hydraulic cylinder and the surface treatment equipment.

[0036] 6. The use of bellows seal or spherical seal structure can well achieve the angle compensation of the surface processing equipment in all directions, and also has a good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 This is an axonometric diagram of the overall structure of the present invention;

[0039] Figure 2 A top view of the present invention;

[0040] Figure 3 It is a cross-sectional view of the present invention;

[0041] Figure 4 This is a structural diagram of the mobile trolley and the driving device of the present invention;

[0042] Figure 5 is a cross-sectional view of the sealing system of the present invention;

[0043] Figure 6 It is a cross-sectional view of the material surface processing equipment of the present invention.

[0044] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0045] 1-Top fixed cover, 101-Annular contact plate, 2-Electrode column hole, 3-Material pipe hole, 4-Movable side cover, 5-Annular track, 6-Mobile trolley, 601-Cylindrical pin gear, 602-Wheel, 603-Counterweight mechanism, 604-Differential device, 7-Flue hole, 8-Side cover support, 9-Furnace body, 10-Cover suspension, 11-Drive device, 1101-Motor reducer, 1102-Coupling, 1103-Worm gear reducer, 1104-Pinion, 12, Sealing system, 1201-Annular support plate, 1202-Adjusting nut, 1203 -Cylindrical spring, 1204-externally threaded pipe sleeve, 1205-annular fixing plate, 1206-spring fixing tube, 1207-annular pressure plate, 1208-graphite packing, 1209-filling sand, 13-material surface processing equipment, 1301-first section of material surface processing rod, 1302-second section of material surface processing rod, 1303-third section of material surface processing rod, 1304-bellows sealing sleeve, 1305-material surface processing bracket, 1306-lifting cylinder, 1307-cylinder fixing seat, 1308-multi-stage hydraulic cylinder, 1309-rotation drive device, 1310-rotating support. DETAILED DESCRIPTION

[0046] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the drawings of the present invention. Based on the embodiments in this application, other similar embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of this application. In addition, the directional words mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only reference to the directions of the drawings. Therefore, the directional words used are used to illustrate rather than limit the invention.

[0047] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0048] Example 1:

[0049] like Figure 1-3The figure shows the basic structure of a preferred embodiment of the present invention, a rotary furnace cover for a high-silicon alloy closed electric furnace, comprising a top fixed cover plate 1, a cover plate hanger 10, multiple groups of movable cover plates, a circular track 5 and a driving device 11, wherein the movable cover plate comprises a movable side cover plate 4, a side cover plate support 8 and a movable trolley 6; the circular track 5 is installed on the furnace cover platform around the furnace body 9, and multiple groups of movable trolleys 6 are interconnected and arranged along the circular track 5 around the circumference of the furnace mouth; the movable trolley 6 is also provided with a cylindrical pin tooth 601 on the side away from the furnace mouth.

[0050] The top fixed cover plate 1 is assembled from several petals. It is equipped with several feed pipe holes 3, electrode column holes 2, flue holes 7, explosion-proof holes, and a furnace access door. Cover plate hangers 10 can be used to lift and adjust the top fixed cover plate 1. The top fixed cover 1 is secured to the upper platform or steel structure by several cover plate hangers 10.

[0051] like Figure 4 As shown, the mobile trolley 6 comprises a frame, wheels 602, a counterweight mechanism 603, a wheel axle, and cylindrical pin gears 601. The wheels 602 are mounted at the bottom of the frame and connected via a wheel axle, which is equipped with a differential device 604. The counterweight mechanism 603 is mounted on the frame. The side cover support 8 is mounted on the mobile trolley 6 near the furnace opening. The movable side cover 4 is fixed to the side cover support 8 and operates synchronously with the mobile trolley 6. Multiple sets of movable side cover 4 are connected by crimping.

[0052] The driving device 11 includes a motor reducer 1101, a coupling 1102, a worm gear reducer 1103 and a pinion 1104. The driving device 11 is installed on the platform of the furnace body 9. The motor reducer 1101 is connected to the input shaft of the worm gear reducer 1103 through the coupling 1102. The output shaft of the worm gear reducer 1103 is connected to the pinion 1104. The pinion 1104 is engaged with the cylindrical pin teeth 601 on the mobile trolley 6.

[0053] like Figure 2 As shown, the driving devices 11 are arranged at intervals of 120° along the circumferential direction of the rotary furnace cover and are powered by an annular contact sliding wire fixed on the platform of the furnace body 9.

[0054] like Figure 5 As shown, the present invention also provides a sealing system for a high-silicon alloy closed electric furnace, including an annular support plate 1201, an adjusting nut 1202, a cylindrical spring 1203, an external threaded pipe sleeve 1204, an annular fixing plate 1205, a spring fixing tube 1206, an annular pressure plate 1207, a graphite packing 1208, filling sand 1209 and an annular contact plate 101.

[0055] The annular fixing plate 1205 is welded and fixed on the movable side cover plate 4, and several annular fixing plates 1205 form an annular fixing bracket; the annular support plate 1201 is welded on the annular fixing plate 1205, and the annular pressure plate 1207 is arranged on the annular fixing bracket and a certain gap is left between it and the annular fixing plate 1205, and the gap is filled with sand 1209.

[0056] The external threaded pipe sleeve 1204 is welded to the annular fixing plate 1205; the adjusting nut 1202 is formed by welding a nut and a circular tube with an inner wall thread, and is threadedly connected to the external threaded pipe sleeve 1204;

[0057] The spring retaining tube 1206 is welded to the annular pressure plate 1207. The cylindrical spring 1203 is fixed to the spring retaining tube 1206 and extends into the interior of the externally threaded sleeve 1204. The annular contact plate 101 is fixed to the side of the top fixed cover plate 1. Graphite packing 1208 is filled between the annular contact plate 101 and the annular pressure plate 1207.

[0058] like Figure 6 As shown, a cross-sectional view of the material surface processing equipment of the present invention includes a rotating support 1310, a rotary drive device 1309, a material surface processing bracket 1305, a multi-stage hydraulic cylinder 1308, a lifting cylinder 1306, a cylinder fixed support 1307 and a material surface processing rod;

[0059] The material surface processing equipment is fixed on the moving trolley 6 of the high silicon alloy closed electric furnace. The rotating furnace cover includes the moving trolley 6 and the movable side cover 4. The moving trolley 6 moves along the bottom track 5 thereof.

[0060] The surface processing rod includes a first section 1301, a second section 1302 and a third section 1303 of the surface processing rod; the surface processing rod is connected to the cylinder fixing seat 1307 to achieve relative sliding; the first section 1301 and the second section 1302 of the surface processing rod are connected by bolts.

[0061] Through the above technical solution, the surface processing rod can be extended and contracted within a certain range, wherein the first section and the second section are connected by bolts for easy replacement.

[0062] The multi-stage hydraulic cylinder 1308 is fixed in the cylinder fixing seat 1307, and the end of the multi-stage hydraulic cylinder 1308 is fixed at the second section 1302 of the material surface processing rod. The oil rod of the multi-stage hydraulic cylinder 1308 moves in the air cavity formed by the second section 1302 and the third section 1303 of the material surface processing rod.

[0063] The purpose of the above scheme is that the air cavity can isolate part of the radiant heat and provide good protection for the multi-stage hydraulic cylinder 1308; when the surface processing operation is completed, the multi-stage hydraulic cylinder 1308 shrinks to its initial state, which can prevent the cylinder execution part from being subjected to high temperature baking for a long time, and at the same time the circulating hydraulic oil plays a role in cooling.

[0064] The oil cylinder fixing seat 1307 is fixed on the material surface processing bracket 1305 through a pin connection. One end of the lifting oil cylinder 1306 is connected to the material surface processing bracket 1305, and the other end is connected to the oil cylinder fixing seat 1307, which is used to adjust the pitch angle of the material surface processing rod.

[0065] The material surface processing bracket 1305 is installed on the rotary drive device 1309, and the rotary drive device 1309 is fixed to the rotating support 1310 by bolt connection. The rotary drive device 1309 is driven by a hydraulic motor; the rotating support 1310 is installed on the mobile trolley 6.

[0066] The purpose of the above solution is to achieve the rotation of the material surface treatment rod along the circumferential direction at a specific angle, and to enable the material surface treatment device to reciprocate along the circumference or at a fixed angle along the furnace body 9 with the trolley. The same function can also be achieved by using a transmission mechanism such as a motor or gear instead of the rotary drive device 1309.

[0067] The movable side cover plate 4 is provided with a hole, and a flange is welded to the outer ring of the hole. The material surface processing rod passes through the hole on the movable side cover plate 4 and extends into the high silicon alloy closed electric furnace.

[0068] The material surface processing equipment also includes a bellows sealing sleeve 1304, which has flanges at both ends. One end of the bellows sealing sleeve 1304 is connected to the cylinder fixing seat 1307, and the other end is connected to the flange on the movable side cover plate 4 of the rotary furnace cover. The cylinder fixing seat 1307 can achieve an offset in all directions within a certain range inside the bellows sealing sleeve 1304, thereby facilitating the pounding movement of the material surface processing rod.

[0069] The purpose of the above solution is to compensate for the angular deviation of the cylinder fixing seat 1307 in the four directions in a closed state through the sealing device, so as to handle the material surface processing operation at a specific position.

[0070] The high-silicon alloy closed electric furnace is provided with a high-temperature resistant infrared detection device, which, in conjunction with the rotating furnace cover 1 and the material surface processing equipment, can realize precise tamping operations at multiple positions and angles in the furnace.

[0071] like Figure 2 As shown, the electrode columns are distributed in a triangle in the middle of the rotary furnace cover. Three material surface processing devices are set along the circumference of the rotary furnace cover 1, arranged at intervals of 120 degrees and installed on the vertical plane of the center line of each pair of electrode columns.

[0072] Example 2:

[0073] This is an application example of the present invention. During operation, the top fixed cover plate 1 and the movable cover plate are sealed by a sealing system 12. Tightening the adjustment nut 1202 presses down the cylindrical spring 1203. The deformation of the cylindrical spring 1203 transmits pressure to the annular pressure plate 1207. The annular pressure plate 1207 slides along the annular support plate 1201 and acts on the graphite packing 1208, causing the graphite packing 1208 to contact the annular contact plate 101 with pressure, thereby achieving a seal for the rotary furnace cover. Sand filling 1209 is also provided in the gap between the annular fixed plate 1205 and the annular pressure plate 1207. When the annular pressure plate 1207 slides due to the spring, the sand filling ensures the reliability of the seal.

[0074] When tamping begins, the drive unit 11 engages with the cylindrical pin gear 601 on the mobile trolley 6 through the pinion 1104, driving the mobile trolley 6 to move along the circular track 5 on the furnace body 9 platform, realizing the rotational movement of the furnace cover movable cover. When surface processing is required, the lifting cylinder 1306 adjusts the extension length to control the pitch angle of the surface processing rod, controls the extension length of the multi-stage hydraulic cylinder 1308 to control the starting position of the surface processing, and then follows the extension of the multi-stage hydraulic cylinder 1308 to perform surface processing. The rotary drive unit 1309 controls the horizontal swing angle of the surface processing equipment. When the surface processing is completed, the multi-stage hydraulic cylinder 1308 shrinks to its initial state, and the hydraulic oil (using non-flammable and non-explosive water glycol hydraulic medium) acts as a circulating cooling oil to reduce the temperature. At the same time, the surface processing rod is baked away from the high-temperature area in the furnace, thereby increasing the service life of the equipment.

[0075] In summary, the present application provides a rotary tamping system for a high-silicon alloy closed electric furnace, which divides the traditional furnace cover into two parts. One part is a fixed top cover plate, which can be lifted by a cover plate hanging like a traditional furnace cover; the other part is composed of multiple groups of movable cover plates. By setting a circular track on the furnace body, the movable cover plate is driven by a driving device to rotate along the circular track, so that the rotary furnace cover can realize automatic tamping, avoid manual operation, improve the production environment, and greatly reduce the risk of safety accidents; at the same time, the split rotary furnace cover is conducive to reducing the number of furnace cover hangings and the size of their load, which helps to optimize the plant structure design and reduce civil engineering investment costs.

[0076] Furthermore, the material surface treatment equipment of the present application can perform reciprocating motion along the furnace body in a circular or fixed-angle manner along with the rotating furnace cover, overcoming the problem that the rotating furnace body is commonly used to loosen the furnace charge in high-silicon alloy production, which can only assist in loosening the charge, and ensuring good air permeability of the material surface. The present application meets the requirements for tamping the high-silicon alloy electric furnace in a closed smelting state, avoiding the risk of CO poisoning caused by the overflow of flammable and explosive gases such as CO during production, or the risk of CO flash explosion during the opening of the furnace door.

[0077] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A rotary ramming system for a high silicon alloy closed electric furnace, characterized in that: Including rotary furnace cover, material surface handling equipment and sealing system; The rotary furnace cover includes a top fixed cover plate, multiple groups of movable cover plates, a circular track and a driving device. The movable cover plate includes a movable side cover plate, a side cover plate support and a moving trolley. The side cover plate support is installed near the furnace opening of the moving trolley. The movable side cover plate is fixed on the side cover plate support and runs synchronously with the moving trolley. The driving device is used to drive the moving trolley to rotate. The circular track is installed on the furnace cover platform around the furnace body. Multiple groups of moving trolleys are connected to each other and arranged along the circular track around the circumference of the furnace opening. The material surface processing equipment is fixed on the mobile trolley; The sealing system includes an annular support plate, an adjusting nut, a cylindrical spring, an external threaded pipe sleeve, an annular fixing plate, a spring fixing pipe, an annular pressure plate, graphite packing, filling sand and an annular contact plate; The annular fixing plate is welded and fixed on the movable side cover plate, and a plurality of annular fixing plates form an annular fixing bracket; the annular support plate is welded on the annular fixing plate, and the annular pressure plate is arranged on the annular fixing bracket with a certain gap between the annular fixing plate and the annular pressure plate, and the gap is filled with sand; The externally threaded pipe sleeve is welded to the annular fixing plate; the adjusting nut is composed of a nut and a circular tube with an inner wall thread, and is threadedly connected to the externally threaded pipe sleeve; the spring fixing tube is welded to the annular pressure plate, and the cylindrical spring is fixed on the spring fixing tube and extends into the interior of the externally threaded pipe sleeve; the annular contact plate is fixed to the side of the top fixed cover plate, and graphite packing is filled between the annular contact plate and the annular pressure plate.

2. The rotary tamping furnace system according to claim 1, characterized in that: The movable trolley is further provided with cylindrical pin teeth on the side away from the furnace mouth; the connection mode of the multiple groups of movable small workshops is any one of elastic connection with adjustable spacing and rigid connection.

3. The rotary tamping furnace system according to claim 2, characterized in that: The mobile trolley includes a frame, wheels, a counterweight mechanism and a wheel axle. The wheels are arranged at the bottom of the frame and connected through the wheel axle. The wheel axle is provided with a differential device, and the counterweight mechanism is installed on the frame; multiple groups of movable side cover plates are connected by crimping or any of the connection methods.

4. The rotary tamping furnace system according to claim 3, characterized in that: The driving device includes a motor reducer, a coupling, a worm gear reducer and a pinion. The driving device is installed on the furnace cover platform. The motor reducer is connected to the input shaft of the worm gear reducer through a coupling. The output shaft of the worm gear reducer is connected to the pinion. The pinion is engaged with the cylindrical pin teeth on the mobile trolley. The driving device is arranged in equal parts at intervals of 120° along the circumferential direction of the rotating furnace cover.

5. The rotary tamping furnace system according to claim 1, characterized in that: The material surface processing equipment also includes a rotating support, a rotary drive device, a material surface processing bracket, a multi-stage hydraulic cylinder, a lifting cylinder, a cylinder fixing seat and a material surface processing rod; The surface processing rod includes a first section, a second section and a third section; the surface processing rod is connected to the oil cylinder fixing seat to achieve relative sliding; the first section and the second section of the surface processing rod are connected by insulated bolts.

6. The rotary tamping furnace system according to claim 5, characterized in that: The multi-stage hydraulic cylinder is fixed in the cylinder fixing seat, the end of the multi-stage hydraulic cylinder is fixed to the second section of the material surface processing rod, and the oil rod of the multi-stage hydraulic cylinder moves in the air cavity formed by the second and third sections of the material surface processing rod.

7. The rotary tamping furnace system according to claim 6, characterized in that: The oil cylinder fixing seat is fixed to the material surface processing bracket through a pin connection. One end of the lifting oil cylinder is connected to the material surface processing bracket, and the other end is connected to the oil cylinder fixing seat, which is used to adjust the pitch angle of the material surface processing rod; the material surface processing bracket is installed on the rotary drive device, and the rotary drive device is fixed to the rotating support through a bolt connection. The rotary drive device is driven by a hydraulic motor; the rotating support is installed on the mobile trolley.

8. The rotary tamping furnace system according to claim 1, characterized in that: The movable side cover is provided with a hole, and a flange is welded to the outer ring of the hole. The material surface processing rod passes through the hole on the movable side cover and extends into the high-silicon alloy closed electric furnace; the material surface processing equipment also includes a sealing device, which is arranged at the hole; the sealing device is any one of a bellows sealing sleeve and a joint shaft spherical seal; the material surface processing equipment is provided with 3 along the circumferential direction of the rotary furnace cover, and is arranged equally at an interval of 120°; the rotary furnace cover is also provided with a cover plate hanger.

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